Drilling machine



June 15 i, 1926.

G. H. lGILMAN DRILLNG MACHINE Filed Jne 5. 1920 mmum um mmmmmrlw v Patented June 15, 1926.

1,588,401 PATENT- oFFlcE.

UNITED STATES ,GEORGE H. GILMAN, OF BOSTON, MASSACHUSETTS.

DnILLINe Application filed Jung 5,

My, invent-ion -will be best understood from the 'following specification when read in connection with the accompanying drawv 1o ings' showing one specific embodiment of my invention submitted for illustrative purposes, while the scope of my invention will be more particularly pointed out in the appended claims. I

In the'drawings:

Fig. A1 shows for the most part in longitudinalsection, a rock drill embodying my invention; Fig.2 is a fragmentary section on the line 2 2 of Fig. 1;

Fig. 3 1s a section similar to Fig, 2 with the valves"'omitted;

Fig.'4 is a. section on the line 4 4 of 4 Fi 1; y Fign is a section on the line 5 5 of Fig. 1;

Fig. 6 isl Fig."7 is ajsection on the-line 7 7 of Fig. 8 is a section on the line 8 8 of Fig.

1; and v Fig. 9 shows in perspective on an enlarged scale a portion ofthe mechanism for holding the water tube in position. I vThe drilling machine submitted, showing a specific embodiment of my invention, coma section .on the line 6 6 of prises a. casing having a cylinder member 1 and a front head structure 2. Mounted for y 40 reciprocation inthe cylinder is a piston 3 provided with a hammer bar 4 extending into. yheront head structure and adapted to operate by impactV on the polygonal end 5 of kthegdrill steel 6, the end .of the steel being reived by a olygonal recess in a. chuck 7, andthe latter eing mounted for rotation in x'thef fronthead structure. Besides operating the'steel by impact I also prefer to operate it lby impart-ing thereto from the piston -a rotary movementy and for this purpose I rovide suitable mechanism which will now Ee described. y "-Rearwardly of the cylinder andpreferably in the rearffhead structure whfch comprises the block 8,"I mount a pair of ratchet ywheels 9 and 10 to which are secured ride p piston.

lthe' cylinder and MACHINE. 1920. serial No. 386,868.

bars 11 and 12 which extend through the cylinder into the piston and respectively engage the rifle nuts 13 and 14 carried by said The rifle bars 11l and 12 lust referred to are, as clearly illustrated y Fig. 1, arranged in telescopic relation, the outer rifle bar 11 vbeing secured to the .ratchet ring r10 and the inner rifle bar 12 being secured -to the ratchet ring 9. On the exterior surfaceof the ride bar 11 are formed grooves.

15 which cooperate with lugs 16 on the rifle nut 21S-while on the exterior surface of. the rifle bar 12 are formed grooves 17 cooperating with the lugs 18 formed on the interior surface of the riiie nut 14. The hammer bar 4 extendsy into and is surrounded by the chuck. For connecting the hammer bar to the chuck, on the exterior surface of the hammerbar I provide grooves 19 cooperating with lugs 20 formed on the interior surface of the chuck. Preferably, the grooves 15 and 17 are formed with the same pitch and are oppostely inclined, while the grooves 19 are parallel to the axis of the piston and hammer bar. The ratchets 9 and 10 cooperate 'with suitable p-awls 21 held in engagement therewith by spring pressed detents 22 the ratchets and pawls being so' vby the pawls.

When the piston is reciprocated by motive fluid admitted and exhausted in a manner hereinafter described, the piston on the rearward stroke, is rotated by the rie bar 12 in the direction indicated by the arrows in Fig. 1 and on the forward stroke is rotated in the samedirectionghy the` riflebar 11. When the piston rotates, it rotates the chuck and as the pitch of 4the ygrooves 15 andl 17 is the same, the chuck is rotated during each stroke of the piston in the same direction and through 'the same angle.

For operating the piston AI provide vthe valve 23, which preferably, as illustrated by Fig. 2, is provided with an internal con duit 24 making the valve of the shape which I prefer to term tubular.

The valve extends ylongitudinally of communicates therewith throughpassages 25 and 26, which connect the cylinder and valvechambers adjacent the corresponding vopposite ends thereof. Leading to the valve chamber and communicating with the internal conduit 2A of the vaive is a motive iuid supply conduit 2T, these conduits forming part of the in! let connection adapted alternately ,to be placed in connnunication with the opposite ends of the cylinder by the valve. When the valve is in the position shown by Fig. l, the motive fluid flows through the interior of the valve and enters the passage 2G passing into the front end of the cylinder to drive thepiston rearwardly and when the valve is'in its opposite position, the passage 26 is cut off from communication with the inlet connectionand motive fl uid is supplied to the passage 25 to admit the same to .the rear end of the cylinder to drive the piston forwardly. Y

For exhausting the ends of the cylinder, I provide on the exterior of the valve adjacent the ends thereof, grooves 28. and 29 and respectively cooperating therewith, grooves 30 and 30 formed interiorly ot' the valve casing and providing exhaust chan1 bers. y The chambers formed by the grooves 30 and 30 are maintained in constant conrmunication with the atmosphere by means of conduits 31 which are maintained in constant communication with the grooves 30 and 30 by means of slots 32 and respectively formed in the valve casing sleeves and body of the main cylinder portion. lVhen the yvalve is in position illustrated by Fig. 1, the groove 28 of the valve connects the passage 25 with the groove 30 and thus exhausts-the rear end of the cylinder. lVhen the valve is in its opposite position as illustrated by Fig. 2, the groove 29 connects the passage 26 with the groove 30and thus exhausts the forward end of the cylinder.

For providing additional exhaust means, adjacent the central pgrtion of the cylinder I provide radial passages 35 which communicate with the passages 3l. The passages 35, as will be understood by those 'skilled in the art are adapted to be uncovered by the piston as it approaches the end of its stroke to permit the motive fluid behind it to exhaust.

For moving the valve, -I provide the same with an enlarged portion 36 which provides oppositely facing surfaces 37 and 38. Communicating with the surface 37 is a kicker port 42 which opens into the cylinder at 39 and communicating with the sur- Iface 38 is a kicker port 4l which opens into the cylinder at 40. As t-he piston reeiproeates, it alternately covers and neovers the ends 30 and 40 of the kicker ports and thus alternately admits and exhausts motive4 fluid to the surfaces 37 and 38 to m'ove the valve.I

Preferably, I provide means for lockingthe valve when it has been moved to the opposite ends of its travel. For this purpose I form the valve to provide oppositely facing surfaces 43 and 44, preferably smaller in area than the surfaces 37 and 33 and respectively facing in the same direction as the latter and being located between them and the corresponding ends of the valve. To the surfaces 43 and 44 I admit motive fluid to lock the valves inposition. For this purpose, I provide the valve with radial, passages 45 and 4G coimnuuicating with the interior conduit thereof and adapted to be alternately opened and closed by the valve, when moved by the motive fluid admitted against the surfaces 37 and 33. For exhausting the mot-ive fluid from the surfaces 43 ard 44 I provide passages 4i' and 48, one end of these respectively being in constant communication with the valve chamber adjacent the surfaces 43 and 44 and the other ends respectively being adapted alternately to be placed 1n communica-- tion with the exhaust chambers 30 and '30.

For controlling the exhaust passages 47 and 43, thc same respectively are formed tol terminate on the interior surface kof the.

valve casing between the opposite annulai.`

which abuts the shoulder` 54 formed on the v inner member 51.0f the valve casing at one end and the head block 8 at the other end.v

The valve casing thus formed, is provided on the Interior thereof with annular' grooves 49, 30', 53, 54, 55 and 5G. The annular grooves 49 and 56 respectively` connect with the opposite. cylinder portions through the passages 25 and 26 and the grooves 53, 54, and 55 respectively form chambers for the shoulder portions of the valve forming the surfaces 43, 37, 38 and 44.

'The operation of the valve and associated mechanism is as follows: lVith the parts in the position shown by Fig. 1, the motive fluidtlows from the rear end to the forward end of the valve through the internal bore 24 into the grooves 56 ofthe valve casing and hence into the forward end of the cylinder through the passage. 26 forcing the piston rearwardly. The Huid at the rear of the piston exhausts through the exhaust port 35 into the conduits 31 antldiseharges to the atmosphere, while at the' same tune and a Fler the passage 35 is closed, mot-ive fluid also.

exhausts through the passage 25 around theI reduced portion 23 of the valve, into the chamber 30 and hence. to the exhaust passage,

31 by Way of the-slots 32 and 33 whence it' passes to the atmosphere. In this position iso j' of the'valve, the air from the locking surface 43 is exhausted through the passage 47 `which at this time is -open to the exhaust,

while motive fluid is admitted to the surface 38 toholdA the valve in position through the passage 46 which at this time is open. lVhen the frontend of the piston uncovers the end 3,9 of the kicker port 42, motive lluid'is admitted from the cylinder-through the passage 42 to act on thelsurface- 37 of the valveto throw it forwardly. As the valve moves forwardly, the passage 46 1s cut oil and immediately after this, the formotive fluid is admitted to thesu'rface 88 of the valve to throw it rearwardly. The rearward movement of the valve closes the exhaust port 48 leading from the surface 44 and opens the inlet port 46 which admits fluid to the surface 44 to hold the valve in its rearward position. The cycle of operation is now repeated.

The head block 8 before referred to is preferably provided with a longitudinal bore 60 to receive a manually operated throttle valve 61, the end of the bore` 60 being adapted to be connected with the source of motive fluid' for supplying motive fluidfor operating the machine.

Through the valve 61- is formed a longitudinal passage 62 having a transverse passage 63 communicatingtherewith, the latter being adapted to connect in the position of the valve shown by Figs. land 2 with the passage 27 in the valve casing; The exhaust passages 31 vin the valve casing communi- ,cate with the bore 60 through ports 64 which in the position of the valve shown by Figs. 1 and 2 are in communication with the atmosphere by way of passages 65 formed in the valve and communicating passages 66 formed 'in the head block, In the same lane as 'the ports 64 are passages 67 formed 1n the valve and communicating with the live motive fluid passage 62. If the valve is turned counterclockwise, as viewed in Fig. l, the passages 6.5 rare moved'- out of co'mmunication with the ports 64 and the pas-v sages 67 are placed in communication with said ports. This prevents operation of the machine because the exhaust is virtually closed and the motive fluid now admitted to the exhaust passages v31 flows through passages 68 connecting the passages 31 with the rearward end of the chuck chamber 69. Motive fluid thus admitted to the rearward end of the chuck chamber passes to the. forward end thereof by way .of the grooves 19 formed on the exterior surfaces ofthe hainmer bar and the space between the hammer bar and chuck. From the forward end ol the chamber the motive fluid passes into the bore 70 io f the drill steel and flows to the cuttingyend thereof to sludge the hole..

For supplying water to the hollow drill steel, 1 provide a tube 71 supported in thef'fl base of the handle member 73 and extending through the machine to the front end;Y hereof where it enters the bore of the steelg [Communicating by means ofga passage 82j' with a chamber 75 formed in the handlel member 'is a water supply connection 74.V

lFor supportingthe -tube l provide a' member having a base portion 76 and the conical sleeve portion 7 7. The slee-ve member 1s split or slotted as indicated at 79, and is cut away adjacent its juncture with the base 76- to form an annular groove 78.' The slots 79 and grooves 78 render the sleeve' portion flexible. In Vscrew threaded engagement with the chamber 78 is a plug 80 provided corresponds to the taper ofthe conicalsleeve 77. VVhen the plug 80 is screwed `with a conical recess 8l, the taper of which into posit-ion, the conical recess thereof clamps the sleeve against the tube and holds the latter firmly in position. The base portion 76 is adapted to be forced by the plug 80 against the packing82a to compress the same and form a tight joint about the tube to prevent entrance of water into the cylinder chamber. The water admitted to the chamber '80 finds its way through .theslots 79 into the rear end of the recess 81 of the plug whence it passes into the' bore of the tube 71 and finds its way into the hollow drill steel.

It will be observed that I have provided a casing, part of which receives motive fluid for acting upon the vpressure faces of thepiston to effect linear movement of the pist0n and that this part of the casing which I prefer to call the piston chamber and which, in the submitted embodiment of my invention, is the chamber in which the large rear head of the piston reciprocates, has therein the members 11 and 12 which are mounted directly on the casing for rotation.

.Although I have submitted one specific embodiment of myinvention for illustrative llt 4said rifle bars and chuck, at least twoof said separate iiieans providing an oblique cam and a cooperating follower and means for reciprocating said piston, whereby said i chuck isl rotated through' said connecting means during each direction of reciprocation of said piston.

2. In a drilling machine, a cylinder, a piston in said cylinder, a chuck, a plurality of rifle bars cooperating with said piston, separate means connecting` said piston to said ritlebars and chuck, cach of said separate i'iieaiis providing a surface and a cooperating follower and each of said surfaces lieing aiigularly disposed relatively to cach of the other surfaces, and means for recip-- rocating `said piston, whereby 'said chuck is rotated through thc connecting means during cach direction of rccil'irocation of the piston.

In a drilling niacl'iine, a cylinder, a piston therein, a chuck, a plurality ofritle bars cooperating with said piston, oppositely oblique grooves and followers connecting the respective rilie bars to said piston, a-groove parallel to the axis of said piston and a cooperating follower connecting said chuck to said piston, 4and means for alternately preventing rotation of said riie bars on opposite strokes of said piston, whereby said piston is rotated during each directionof reciprocation of said piston.

4.In a drilling machine, a cylinder, a piston therein, a chuck, a plurality of rifle bars cooperatingwith said piston, separate means connecting said piston to said rifle 4bars and chuck, at least two of said separate in ius providing an oblique cam and a cooperating follower and means for reciproo eating said piston, whereby said chuck is "rotated in the' same direction through said connecting means during each direction of reciprocation of said piston.

In a drilling machine, a cylinder, a

piston therein, a chuck, a plurality of riflebars cooperating with said piston, separate means connecting said piston to said rifle bars and chuck, each of said separate means providing a surface and a cooperating follower and each of saidl surfaces being angularl-y disposed relatively to each of the other surfaces, means for reciprocating said piston, .and the anglesbetween said surfaces being such that said chuck is rotated in the same direction through the connecting means during each direction of reciprocation of the piston.

6. In a drillingmachine, a cylinder, a pisr'ton therein, a chuck, a plurality of rifle-bars G0 cooperating with said piston, oppositely oblique grooves and followers connecting the respective 4rifle bars tossaid piston, a groove parallel'to the axis of said piston and a cooperating follower connecting said chuck to said piston, and means for alternately preventing rotation of said rile`bars on opposite strokes of said piston, whereby said piston is rotated in the saine direction,

piston, whereby said chuck is rotatedat the saine sneed in the saine direction through said connecting means during each direction of reciprocation of said piston.

S. In a drilling machine, `a cylinder, a piston therein, a chuck, a plurality of rifle bars cooperating with said piston, separate means connecting said piston to said .rifle bars and chuck, each of said separate means providing a surface and a cooperating follower and each of said surfaces being angularly disposed relatively to each of the other surfaces, means for reciprocating said piston, and the angles between said surfaces being such that saidvchuck is rotated at the same speed:v in the saine direction through the connecting means during each direction 0f reciprocation of the piston..

i). In a drilling machine, a cylinder, a piston therein, a chuck, a plurality of rifle barsv cooperating with said piston. oppositely` oblique grooves and followers connecting the respective rifle bars t0 said piston, a groove parallel to the axis of said piston anda cooperating follower connecting said chuck to said piston, and means for alternately preventing rotation of said rilie bars on opposite strokes of said piston, whereby said piston is rotated at the same speed in the saine direction during each direction of reciprocation of said piston.

10. In a drilling machine, a cylinder, a piston therein, a chuck, a rifle bar, a second rifle bar surrounding said first rifle bar, both of said rifle bars extending into said piston, means comprising grooves and followers iio one rifle bar on one stroke of said piston and of the other riflevbar on the opposite stroke whereby saidpiston is rotated during each stroke in "tl same direction.

12. In a rilling machine, a casing, a ham-` mer piston in saidcasing, said hammer pis- It0n comprising slip-joint connections between said hammer bar and chuck and between said piston and rifie bars.

v, H y, ,j-,l 3. In a drilling machine, acylinder,`a f lfili'ammer piston in said cylinder, a chuck, and '1 ineans--including a plurality of rifiebars for casing said piston to rotate said chuck during each. direction of. reciprocation of said piston comprising slipq'oint connections bef tween said hammer piston and chuck and bevll tween said rifie bars.

14. In a drilling hammer piston and each of said machine, a casing, a piston 3 having the'hammer bar 4, a chuck connected to Said hammer bar, riie bars 11 and 20 12 havinga cam connection with said hammer piston,l and intermittent grip devices 9 and l0 connecting said rifie bars respectively with said casing.

In `testimony whereof, I havesigned A25 name to this specication.' GEORGE H. criminali.y 

